i have a k&n on both d-50s and the wifes dodge spirit that she use to race.still need to get one for the jeep and the expedition.my d-50 has a modified air box.basicly i have the top and bottom pieces cut out to the outer dia of the air filter.the stock box became to restrictive(after many mods) and was making my truck bogg down.with the air cleaner off it ran like a bat out of hell.i modded the housing and have not had a problem since.

87 dodge power ram 50,35" tires,5 1/2" total lift,4.6 gears,lockers front and rear,Rancho RS5000's,custom front bumper,custom rock sliders,cct extended diff breathers,75 amp alt(40 amp stock),thorely header,K&N,wheeled hard...